CS526 ISFET ph Probe Issued: 9.6.14 Copyright © 2009-2014 Campbell Scientific, Inc. Printed under licence by Campbell Scientific Ltd.
Guarantee This equipment is guaranteed against defects in materials and workmanship. This guarantee applies for six months from date of delivery. We will repair or replace products which prove to be defective during the guarantee period provided they are returned to us prepaid.
PLEASE READ FIRST About this manual Please note that this manual was originally produced by Campbell Scientific Inc. primarily for the North American market. Some spellings, weights and measures may reflect this origin. Some useful conversion factors: Area: 1 in2 (square inch) = 645 mm2 Length: 1 in. (inch) = 25.4 mm 1 ft (foot) = 304.8 mm 1 yard = 0.914 m 1 mile = 1.609 km Mass: 1 oz. (ounce) = 28.35 g 1 lb (pound weight) = 0.454 kg Pressure: 1 psi (lb/in2) = 68.95 mb Volume: 1 UK pint = 568.
Precautions DANGER — MANY HAZARDS ARE ASSOCIATED WITH INSTALLING, USING, MAINTAINING, AND WORKING ON OR AROUND TRIPODS, TOWERS, AND ANY ATTACHMENTS TO TRIPODS AND TOWERS SUCH AS SENSORS, CROSSARMS, ENCLOSURES, ANTENNAS, ETC. FAILURE TO PROPERLY AND COMPLETELY ASSEMBLE, INSTALL, OPERATE, USE, AND MAINTAIN TRIPODS, TOWERS, AND ATTACHMENTS, AND FAILURE TO HEED WARNINGS, INCREASES THE RISK OF DEATH, ACCIDENT, SERIOUS INJURY, PROPERTY DAMAGE, AND PRODUCT FAILURE.
Contents PDF viewers: These page numbers refer to the printed version of this document. Use the PDF reader bookmarks tab for links to specific sections. 1. Introduction ................................................................. 1 2. Cautionary Statements............................................... 1 3. Initial Inspection ......................................................... 1 4. Quickstart .................................................................... 2 4.1 4.
Appendices A. Importing Short Cut Code ...................................... A-1 A.1 Importing Short Cut Code into a Program Editor ............................A-1 B. Example Program ................................................... B-1 C. Calibration ............................................................... C-1 C.1 Example Calibration Program .......................................................... C-2 9-1. Tip of the CS526 probe .............................................................
CS526 ISFET pH Probe 1. Introduction The CS526 ISFET pH Probe measures pH from 2 to 12 in aqueous or semi-solid solutions. It outputs TTL serial data that is read by compatible dataloggers (see Section 6, Specifications). Before using the CS526, please study • • • Section 2, Cautionary Statements Section 3, Initial Inspection Section 4, Quickstart More detailed instructions for operation, troubleshooting, and maintenance are available in the remaining sections. 2. 3.
CS526 ISFET pH Probe The model number and cable length are printed on a label at the connection end of the cable. Check this information against the shipping documents to ensure the correct product and cable length are received. 4. Quickstart For complete installation, programming, and calibration information, see Sections 7.1 through 7.3. 4.1 Preparation for Use and Installation 1. Soak the CS526 in 7-pH buffer solution for 15 minutes. 2.
User Manual 3. When Short Cut opens, select New Program. 4. Select Datalogger Model and Scan Interval (default of 5 seconds is OK for most applications). Click Next.
CS526 ISFET pH Probe 5. Under the Available Sensors and Devices list, select the Sensors | Water | Quality folder. Select CS526 ISFET pH Probe. Click selection to the Selected device window. 4 to move the 6. After selecting the sensor, click at the left of the screen on Wiring Diagram to see how the sensor is to be wired to the datalogger. The wiring diagram can be printed out now or after more sensors are added. 7.
User Manual 5. 8. If LoggerNet, PC400, or PC200W is running on your PC, and the PC to datalogger connection is active, you can click Finish in Short Cut and you will be prompted to send the program just created to the datalogger. 9. If the sensor is connected to the datalogger, as shown in the wiring diagram in step 6, check the output of the sensor in the datalogger support software data display to make sure it is making reasonable measurements.
CS526 ISFET pH Probe Sensor Material: PEEK Weight w/10-ft cable: 318 g (11.2 oz) Dimensions Length: Diameter: 102 mm (4 in) 16 mm (0.63 in) Certifications: 7. ISO 9001 compliant EMC standard IEC61326:2005 Operation If you are programming your datalogger with Short Cut, skip Section 7.1, Wiring, and Section 7.2, Datalogger Programming. Short Cut does this work for you. See Section 4, Quickstart, for a Short Cut tutorial. 7.1 Wiring Table 7-1. Wiring CAUTION 7.
User Manual Table 7-2. “Get Data” Command and Response Command Response aMn! a Where: a = probe address (factory default is 1) n = a single dummy character (typically use 1) Where: a = probe address (factory default is 1) = the probe’s reading for pH (in digital counts). 7.2.2 CRBasic Instruction Sequence A sequence of CRBasic instructions is used to measure the sensor. Table 7-3 shows the instruction sequence. Information about the instructions is provided in Section 7.2.
CS526 ISFET pH Probe 7.2.3.2 SerialOut() Instruction The SerialOut() instruction has the following syntax: SerialOut(ComPort,OutString,WaitString,NumberTries,TimeOut) ComPort — the datalogger COM port in which the probe is connected. OutString — use "1M1!"+CHR(13) for the OutString when the default probe address of 1 is used. WaitString — enter the null (“”) WaitString to tell the datalogger to wait for the echo of each character in the OutString NumberTries — enter 0 TimeOut — specifies the time, in 0.
User Manual 7.2.3.4 SplitStr() Instruction The SplitStr() instruction has the following syntax: SplitStr(SplitResult,SearchString,FilterString,NumSplit,SplitOption) SplitResult — an array in which the split string will be stored. SearchString — the string on which this instruction will operate. This will be the variable entered for the Dest parameter for the SerialIn() instruction (see above). FilterString — enter “String” (this value will be ignored because of the SplitOption that will be used).
CS526 ISFET pH Probe Problem: Output signal is at its maximum value. Possible reasons: o Probe is not in fluid. o Chip is polluted. o Diaphragm is polluted. o Chip is scratched. Suggestions: o Put probe in fluid. o Clean probe (Section 9.1, Cleaning). o Probe cannot be fixed if chip is scratched. Problem: Probe response is very slow. Possible reason: o Diaphragm is chipped or polluted. Suggestion: o Clean probe (Section 9.1, Cleaning). Problem: Probe signal is drifting.
User Manual • • • • Instability of the reading Slow calibration Probe will not calibrate pH value doesn’t change as expected when changing samples Additionally, when sampling coloured liquids, the probe should be cleaned when the reference diaphragm is no longer white. 9.1.2 Cleaning Procedure Read Section 9.1.2.1, Cleaning Tips, before following this procedure. CAUTION 1. Place probe in warm tap water (~60°) with a mild detergent and soak for 5 minutes, stir periodically. 2.
CS526 ISFET pH Probe • Proteins, fats, and oils may be removed by scrubbing in a solution of Terg-AZyme (Alconox company), a pepsin solution, or a similar product. Afterwards, rinse thoroughly with deionized or distilled water. • Do not use hydrofluoric acid, acetone, MEK, or similar agents to clean the probe. 9.1.3 Revitalizing Revitalization is performed to regenerate the diaphragm in the pH probe. For best results, clean the probe first as described in Section 9.1.
Appendix A. Importing Short Cut Code This tutorial shows: • • How to import a Short Cut program into a program editor for additional refinement. How to import a wiring diagram from Short Cut into the comments of a custom program. A.1 Importing Short Cut Code into a Program Editor Short Cut creates files that can be imported into CRBasic Editor program editor. These files normally reside in the C:\campbellsci\SCWin folder and have the following extensions: • • • • .
Appendix A.
Appendix B. Example Program The following is a CR1000 program that measures the CS526. This program assumes the CS526 is connected to COM1 (C1 / TX and C2 / RX) on the CR1000.
Appendix B.
Appendix C. Calibration This calibration process uses pH-7 and pH-4 buffer solutions. NOTE Protect the sensing chip from UV radiation during calibration. If calibrating in sun or fluorescent light, shield the sensing chip from UV radiation by using dark containers for the buffer solutions. Load the example CRBasic program into the datalogger (Appendix C.1, Example Calibration Program). Wire the CS526 to the datalogger according to the following diagram.
Appendix C. Calibration C.1 Example Calibration Program Following is a simple example program to facilitate the two-point calibration. Although this is a CR1000 program, the other dataloggers are programmed similarly.
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